Split intersection

A split intersection is a rarely-built at-grade variant of the diamond interchange.

[1] Compared to a conventional four-leg intersection or road crossing, the arterial road is split into separate carriageways by 200 to 300 feet (61 to 91 m), which allows a queue of left turning vehicles behind a completed turn into the crossroad without any conflict to oncoming traffic.

The beginning of one-way traffic at the fourth leg makes the intersections reduce the number of conflicts, similarly to a three-leg T-intersection, to improve traffic flow.

The resulting grid, most often implemented in a city, reduces conflicts to two directions per intersection.

[4][5] The TCI's grade-separated variant is the three-level diamond interchange.